propshow after ConvertMatrix not working?

[radpopl]

ColorMatrix("Rec.709->Rec.601")
propshow.trim(0,10)
return last

If I remove the ColorMatrix, the propShow function works correctly. If I restore the ColorMatrix function, the propShow function doesn't work (nothing appears on the screen, as if the line wasn't there).
Is this a bug or is it just me?

[radpopl]

It seems that sometimes all the properties disappear, which is why the propShow function doesn't display anything. When I manually set the key properties, only those properties appear.

[qyot27]

Plugins that have not been updated to be frameprop-aware will [generally] nuke the frame properties, as they need to be updated to allow for passthrough if they don't touch them (and, obviously, to modify them if they do touch something relevant). It's why the propCopy helper function exists, and why #393 was proposed.

[radpopl]

I see. I thought this function was a "native" AviSynth function and should work correctly.